Ooops,i hit enter by mistake(O:!
They seem to be worried about losing out in the browser market to firefox and opera e.t.c.
Oviously they want domination in this area as well as their operating systems.
Maybe they are doing there bit to keep the web more secure and virus free as i.e7 is more secure than i.e6.
Seems sad to me though that they have chosen to conceide a bit of ground to pirated software.